Factory bean for Burlap proxies. Behaves like the proxied service when
used as bean reference, exposing the specified service interface.
The service URL must be an HTTP URL exposing a Burlap service.
Supports authentication via username and password.

Burlap is a slim, XML-based RPC protocol.
For information on Burlap, see the
Burlap website

Note: Burlap services accessed with this proxy factory do not have to be
exported via BurlapServiceExporter, as there isn't any special handling involved.